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The non persistent cookies are in-memory cookies which are are added to the memory of browser but not recorded in any file and does not stored on the client's HD.
Adding the expiration time to the non persistent cookie to persistent cookie.
The persistent cookies are stored onto the client's HD.
persistent cookies are stored in client's hard disk.
non-persistent cokies are stored in browser processer in tempararily. its also called inmemory cokies.